Year	years
1960	51.386
1961	51.791
1962	52.021
1963	52.396
1964	52.642
1965	53.017
1966	53.194
1967	53.524
1968	53.791
1969	54.176
1970	54.573
1971	54.86
1972	55.327
1973	55.688
1974	55.727
1975	56.011
1976	56.064
1977	56.347
1978	56.45
1979	56.695
1980	57.006
1981	57.266
1982	57.456
1983	58.037
1984	58.276
1985	58.523
1986	58.608
1987	58.778
1988	58.903
1989	58.896
1990	58.423
1991	57.919
1992	56.583
1993	56.611
1994	57.044
1995	58.009
1996	58.594
1997	58.849
1998	59.539
1999	60.276
2000	61.032
2001	61.697
2002	62.589
2003	63.161
2004	63.881
2005	64.154
2006	64.762
2007	65.189
2008	65.623
2009	65.976
2010	66.255
2011	66.64
2012	66.905
2013	67.482
2014	67.813
2015	68.081
2016	68.411
2017	68.953
2018	69.693
2019	70.23
2020	62.986
2021	65.646
2022	70.55